ABS adhesion problem? On the contrary...  

ABS adhesion problem? On the contrary...

I'm making a circular item that's over 40cm in diameter, so I split it into quadrants.  It needs to be quite strong, so I'm printing it in ABS, with 4 perimeters and 25% cubic infill.  

Since it's quite a big item I was expecting some lifting, so I used glue stick, which always helps a lot with ABS.  I watched it throughout, and was feeling quite smug that it wasn't lifting from the build plate at all, but then it got to the top layers and I noticed the characteristic ridges associated with lifting.  And then I noticed this:

So the glue stick adhesion was evidently greater than the magnetic attraction of the plate.  Quite impressive I thought - apart from a wasted ~5hr print of course.

For my next attempt I've cut the circle into six sectors so that each part is short enough to fit sideways across the build plate, rather than corner to corner - theory being that lifting a whole edge might be more difficult than lifting a corner, plus it's shorter so the lifting force may not be so great.  And I've reduced the perimeters to 3 and have been more selective with the infill to reduce it where is isn't needed so much.  I've also swapped the textured plate for a thicker one.

So far so good.

I suspect that my efforts to prevent the plate from lifting will only result in the model itself lifting.  So if my latest attempt doesn't work, does anyone have any tips for reducing the shrinkage that causes the lifting?  I'm currently printing at 260/110, inside a Prusa enclosure.  Does a lower nozzle temperature reduce shrinkage?  I'm loathe to reduce it unless I have to, because I find that IS speeds need a higher temperature - at least, that's been my experience with PETG, so I'm erring on the high side with ABS without actually testing that aspect yet.  Would slower print speeds reduce shrinkage or make it worse?